Re: Why is VARCHAR2(4000) bad ?
Date: Thu, 31 Jan 2008 08:39:24 -0800 (PST)
On Jan 30, 9:53 pm, DA Morgan <damor..._at_psoug.org> wrote:
> Not according to Julian. <g>
I think you should read the presentation again. Julian is talking about the "bind variable length".
From the presentation.
"Multiple child cursors can be caused by bind variable lengths"
Using a varchar2 bind variable in sqlplus:
sql->var b1 varchar2(20)
sql->alter session set events '10046 trace name context forever, level 12';
sql->exec :b1 := 'DBA%'
Excerpt from the trace shows the bind variable rounded to the next
highest (32) and also the real length (20) , just as Julian was
stating in the presentation.
oacdty=01 mxl=32(20) mxlc=00 mal=00 scl=00 pre=00 oacflg=03 fl2=1000000 frm=01 csi=01 siz=32 off=0 kxsbbbfp=1067c31a8 bln=32 avl=04 flg=05value="DBA%"
Again, it has nothing to do with the length of the column in the table, but the choice of the bind variable length.
Andrew Received on Thu Jan 31 2008 - 10:39:24 CST